JP2009197159A - Stabilized halogen-containing resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stabilized halogen-containing resin composition solving the problem wherein a polyvinyl chloride resin for highly heat-resistant electric cables needs to contain much hydrotalcite, and which, results in the decline of the mechanical strength and electrical properties inherent in the resin. <P>SOLUTION: Provided is a stabilized halogen-containing resin composition which comprises a combination of (A) a compounded product of a metal silicate and a calcium hydroxide-based compound and (B) a hydrotalcite. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stabilized halogen-containing resin composition having excellent thermal stability and processing stability. More specifically, the present invention relates to a stabilized inclusion that exhibits a synergistic effect by using a composite of a metal silicate and a calcium hydroxide compound in combination with a hydrotalcite and / or a tin stabilizer. The present invention relates to a halogen resin composition.

  Halogen-containing resins are unstable with respect to heat and light. Therefore, it is necessary to prescribe a heat stabilizer before molding by heating and melting. As the heat stabilizer, metal soaps such as Cd / Ba, Ba / Zn and Ca / Zn; lead-based, tin-based and hydrotalcites are used. However, in recent years, the use of toxic stabilizers is becoming restricted or prohibited, and the use of stabilizers containing Cd and Pb and further Ba is rapidly decreasing. Instead of sleigh, hydrotalcites and Ca / Zn systems are being used widely. Tin is used because it is not as toxic as Cd and Pb. However, hydrotalcites need to be formulated in large quantities for electric wires, particularly high heat-resistant electric wires, and have the drawback of impairing the mechanical strength and electrical insulation of the halogen-containing resin. Tin-based stabilizers are liquid and have drawbacks such as poor processing stability and lowering the softening temperature of the resin.

  The object of the present invention is to form a large amount of about 6 parts by weight or more in the halogen-containing resin even in hydrotalcite having the highest thermal stability in a high heat-resistant electric wire. Another object is to solve the problems of lowering mechanical strength, electrical insulation and the like and increasing costs. Furthermore, it aims at eliminating the instability of the workability of the tin-based stabilizer.

  The present invention relates to (A) a metal silicate and a calcium hydroxide compound represented by the following formula (1) in 100 parts by weight of a halogen-containing resin.

（但し、式中、Ｍ^２＋はＭｇ，Ｚｎ，Ｃｕ等の２価金属の少なくとも１種、好ましくはＭｇおよび／またはＺｎを示し、ｘとｙはそれぞれ０≦ｘ≦０．４，０≦ｙ＜０．１の範囲にある）との複合化物と（Ｂ）ハイドロタルサイト類および／または（Ｃ）スズ系安定剤、を熱安定剤として０．０１〜１０重量部、好ましくは０．１〜４重量部含有させることである。その結果、（Ａ）と（Ｂ）または（Ａ）と（Ｃ）が顕著な相乗効果を示すことを発見した。

(In the formula, M ²⁺ represents at least one divalent metal such as Mg, Zn, and Cu, preferably Mg and / or Zn, and x and y are 0 ≦ x ≦ 0.4 and 0 ≦ y, respectively. <In the range of 0.1) and (B) hydrotalcite and / or (C) tin-based stabilizer, 0.01 to 10 parts by weight, preferably 0.1 It is to contain ~ 4 parts by weight. As a result, it was found that (A) and (B) or (A) and (C) show a remarkable synergistic effect.

  The thermal stability is improved by 150 to 200% as compared with the case of each of (A), (B) and (C). Moreover, when (A) is used in combination with (C), the processing stability of the tin-based stabilizer is remarkably improved, and the softening temperature is also improved.

In the composite of (A) used in the present invention, the metal silicate has a chemical interaction with the calcium hydroxide system, and as a result, the primary crystals of the calcium hydroxide system become extremely small. As a result, the reaction activity is improved. At least ^{20 m} 2 / g or more in BET specific surface area, preferably in ^{30 m} 2 / g or more, the difference between calcium hydroxide of approximately 5 to 10 m ² / g are evident. The production of the compound (A) is a metal silicate represented by the following formula (2).

（但し、式中、Ｍ^２＋はＺｎ，Ｍｇ，Ｃａ等の２価金属の少なくとも１種、好ましくはＺｎおよび／またはＭｇを示し、ａ，ｂおよびｍはそれぞれ０≦ａ≦０．５，０≦ｂ＜１，０＜ａ＋ｂ＜１，０≦ｍ＜２の範囲にある）と酸化カルシウムまたは、酸化カルシウムとＭ^２＋および／またはＡｌが固溶した酸化カルシウムを水媒体中で加熱水和反応させることにより実施できる。この際、水和反応は、好ましくは６０℃以上、特に好ましくは８０℃以上で攪拌下に、好ましくは１０〜３０分間行う。これ以外の製造方法としては、上記水和反応後、Ｍ^２＋および／またはＡｌの水溶性塩、例えば塩化物とか硝酸塩の水溶液を添加反応させることもできる。この後、高級脂肪酸、高級脂肪酸のアルカリ金属塩、リン酸エステル、シラン系またはチタン系、またはアルミニウム系のカップリング剤を（Ａ）の重量に基づき０．１〜１０重量％表面処理することが好ましい。金属ケイ酸塩の例としては、例えば、結晶性の活性白土、酸性白土、無定形のケイ酸アルミニウム、ケイ酸亜鉛、ケイ酸亜鉛アルミニウム等を挙げることができる。水酸化カルシウム系化合物に対する金属ケイ酸塩の複合化量は、０．５〜４０重量％、好ましくは１〜１０重量％、特に好ましくは２〜８ 重量％である。本発明で用いる（Ｂ）ハイドロタルサイト類は、熱安定剤として公知であり、次の組成式（４）

(In the formula, M ²⁺ represents at least one divalent metal such as Zn, Mg, and Ca, preferably Zn and / or Mg, and a, b, and m are 0 ≦ a ≦ 0.5, 0, respectively. ≦ b <1, 0 <a + b <1, 0 ≦ m <2) and calcium oxide, or calcium oxide in which calcium oxide and M ²⁺ and / or Al are solid-dissolved, are heated and hydrated in an aqueous medium. Can be implemented. At this time, the hydration reaction is preferably performed at 60 ° C. or higher, particularly preferably at 80 ° C. or higher, with stirring, preferably for 10 to 30 minutes. As another production method, after the hydration reaction, a water-soluble salt of M ²⁺ and / or Al, for example, an aqueous solution of chloride or nitrate can be added and reacted. Thereafter, the surface treatment may be performed on a higher fatty acid, an alkali metal salt of a higher fatty acid, a phosphate ester, a silane-based or titanium-based, or aluminum-based coupling agent based on the weight of (A) by 0.1 to 10% by weight. preferable. Examples of metal silicates include crystalline activated clay, acidic clay, amorphous aluminum silicate, zinc silicate, zinc aluminum silicate, and the like. The composite amount of the metal silicate with respect to the calcium hydroxide compound is 0.5 to 40% by weight, preferably 1 to 10% by weight, particularly preferably 2 to 8% by weight. The (B) hydrotalcite used in the present invention is known as a heat stabilizer and has the following composition formula (4):

（但し、式中、Ａ^ｎ−はｎ価（ｎは整数）のアニオン、好ましくはＣＯ_３ ^２−を示し、ｄとｐはそれぞれ次の範囲、０＜ｄ＜０．５，好ましくは０．２５＜ｄ＜０．４，０≦ｐ＜４，にある）で表わされる。このハイドロタルサイト類も、（Ａ）と同様の表面処理が行われていることが好ましい。好ましくは２次粒子径が１μｍ以下で、ＢＥＴ比表面積が５〜２０ｍ^２／ｇである。本発明で用いる（Ｃ）スズ系安定剤は、次の一般式（５）

(In the formula, A ⁿ⁻ represents an n-valent anion (n is an integer), preferably CO ₃ ²⁻ , and d and p are in the following ranges, 0 <d <0.5, preferably 0. 25 <d <0.4, 0 ≦ p <4). The hydrotalcite is preferably subjected to the same surface treatment as (A). Preferably, the secondary particle diameter is 1 μm or less and the BET specific surface area is 5 to ²⁰ m ² / g. The (C) tin-based stabilizer used in the present invention has the following general formula (5):

（但し、式中、Ｒはメチル、ブチル、オクチル等のアルキル基を示し、Ｙはメルカプタイド類、マレエート類、カルボキシレート類の１種以上を示し、ｚは１または２である）で表わされる有機スズ化合物である。具体例としては、例えばモノまたはジメチルスズテアロキシエチルメルカプタイド、ジメチルスズ−２−エチルヘキシルチオグリコレート、ジブチルスズマレエート、ジブチルスズジラウレート、ジメチルスズビス−２−エチルヘキシルチオグリコレート、モノまたはジオクチルスズ−２−エチルヘキシルチオグリコレート、等を挙げることができる。

(Wherein, R represents an alkyl group such as methyl, butyl, octyl, etc., Y represents one or more of mercaptides, maleates, and carboxylates, and z represents 1 or 2) It is a tin compound. Specific examples include, for example, mono- or dimethyltin tearoxyethyl mercaptide, dimethyltin-2-ethylhexyl thioglycolate, dibutyltin maleate, dibutyltin dilaurate, dimethyltin bis-2-ethylhexylthioglycolate, mono or dioctyltin-2 -Ethylhexyl thioglycolate, etc. can be mentioned.

  The preferred combined weight ratio of (A) and (B) is (A) :( B) = 20-80: 80-20, particularly preferably 40-75: 60-25. The preferred combined weight ratio of (A) and (C) is (A) :( C) = 5-40: 95-60, particularly preferably 15-40: 85-60. When used in combination, the initial colorability, which is a drawback of (A), is eliminated, the thermal stability is greatly improved, and the stability of torque during processing of the tin stabilizer is improved, and the softening temperature of the resin The decline is also improved.

  The stabilized halogen-containing resin of the present invention comprises (a) 0.01 to 2 parts by weight, preferably 0.1 to 1 part by weight of an organic acid salt of zinc and / or calcium, in addition to the stabilizer of the present invention. (B) 0.001-2 parts by weight, preferably 0.01-1 part by weight of β-diketones, (c) 0.0001-5 parts by weight, preferably 0.1-2 parts by weight It is preferable to use alcohols and (d) 0.1 to 100 parts by weight of a plasticizer alone or in combination.

  Examples of the organic acid salt of (a) zinc and / or calcium used in the present invention include zinc and / or calcium metal salts of organic acids such as lauric acid, palmitic acid and stearic acid.

  The (b) β-diketone used in the present invention is a compound useful for preventing initial coloring, and is represented by the following general formula (6).

（式中、Ｒ_１およびＲ_３は同一または異なってもよく、３０個までの炭素原子を有する直鎖または分枝状のアルキルまたはアルケニル基、アリール基、または脂環式基、Ｒ_２は水素、アルキル基、アルケニル基を表す）で表わされる化合物である。このようなβ−ジケトン類の中で好ましく用いられるものとして、例えば、ジベンゾイルメタン（ＤＢＭ）、ステアロイルベンゾイルメタン（ＳＢＭ）、ベンゾイルアセトン、アセチンアセトン、デヒドロ酢酸等を挙げることができる。

Wherein R ₁ and R ₃ may be the same or different and are straight or branched alkyl or alkenyl groups, aryl groups, or alicyclic groups having up to 30 carbon atoms, R ₂ is hydrogen Represents an alkyl group or an alkenyl group. Preferred examples of such β-diketones include dibenzoylmethane (DBM), stearoylbenzoylmethane (SBM), benzoylacetone, acetinacetone, and dehydroacetic acid.

  The (c) polyhydric alcohol used in the present invention is useful for improving heat stability, and is a polyhydric alcohol or a partial ester of a polyhydric alcohol and a mono- or polycarboxylic acid. Examples of such compounds include mannitol, sorbitol, pentaerythritol, dipentaerythritol, trimethylolpropane, and the like.

  Examples of the plasticizer (d) used in the present invention include phthalate esters such as DOP and DINP, aliphatic dihydrochloride plasticizers such as DOA and DOS, chlorinated puff fins, polyesters, epoxys, phosphorus And acid ester type, trimellitic acid ester type such as TOTM, TIDTM, and the like.

  In the composite used in the present invention, the strongly alkaline (in other words, solid base) calcium hydroxide compound interacts with the solid acid of the metal silicate, and the donating electrons of the calcium hydroxide compound are electron-accepting. It is thought that the solid acid of the saponification reduces the coloration of the vinyl chloride and has a chemical neutralization action to suppress the decomposition of the vinyl chloride and other additives. The X-ray diffraction pattern is It shows that of calcium hydroxide and no other crystalline material is detected. Therefore, it is inferred that the complexed product neutralizes the action of the solid acid and the solid base interacting with each other. By this neutralization, it is considered that the composite of the present invention makes it possible to reduce coloring during the halogen-containing resin processing and to suppress an increase in torque.

  Compared with the case of not complexing, the complexed product of the present invention has finer calcium hydroxide crystals, and thus has a higher BET specific surface area than the calcium hydroxide compound, and improves the heat stabilization time of the halogen-containing resin. There is also an effect.

  Examples of the halogen-containing resin used in the present invention are as follows. Polyvinyl chloride, polyvinylidene chloride, chlorinated polyethylene, chlorinated polypropylene, chlorinated rubber, vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, vinyl chloride-styrene copolymer Polymer, vinyl chloride-isobutylene copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-styrene-maleic anhydride terpolymer, vinyl chloride-styrene-acrylonitrile copolymer, vinyl chloride-butadiene copolymer , Vinyl chloride-isoprene copolymer, vinyl chloride-chlorinated propylene copolymer, vinyl chloride-vinylidene chloride-vinyl acetate terpolymer, vinyl chloride-acrylic acid ester copolymer, vinyl chloride-maleic acid ester copolymer Polymer, vinyl chloride-methacrylate copolymer, vinyl chloride Acrylonitrile copolymer, vinyl chloride - Various Binirue - ether copolymer chlorine-containing synthetic resin. Blends of these chlorine-containing synthetic resins with each other or with other chlorine-free synthetic resins, block copolymers, graft copolymers, and the like.

Other conventional additives can be blended in the resin composition of the present invention. Examples of such other additives include the following. Phosphite heat stabilizers such as bisphenol A tetra C _12-15 alkyl diphosphite, tridecyl phosphite, trilauryl phosphite, tris (monophenyl) phosphite. Epoxy stabilizers such as epoxidized vegetable oils, epoxidized oleic acid esters, and epoxidized erucic acid esters. Sulfur-containing compound stabilizers such as thiodipropionic acid and diethylthiodipropionic acid ester. Phenolic stabilizers such as alkyl gallates, phenols such as alkylated phenols, and styrenated phenols. Α-amino acids such as glycine, alanine, leucine, isoleucine, glycinamide, histidine ethyl ester, tryptophan benzyl ester and functional derivative stabilizers thereof. Styrenated paracresol, 2,6-ditertiary butyl-4-methylphenol, butylated anisole, 4,4'-methylenebis (6-tertiarybutyl-3-methylphenol), 2 , 2'methylenebis (6-tertiarybutyl-4-methylphenol), 1,3,5-trimethyl-2,4,6-tris (3,5-ditertiarybutyl-4-hydroxybenzyl) Antioxidants such as benzene and tetrakis [3- (4-hydroxy-3,5-ditertiarybutylphenyl) propionyloxymethylene] methane.

  The blending amount of these additives can be appropriately selected. For example, about 0.01 to about 5 parts by weight of stabilizers and about 0.01 to about 2 parts by weight of antioxidant with respect to 100 parts by weight of the halogen-containing resin. Agents are exemplified. In the present invention, other than conventional additives, other conventional additives such as lubricants, processing aids, weather resistance improvers, antistatic agents, antifogging agents, reinforcing agents, fillers, pigments and the like may be blended. . In the present invention, mixing and kneading of the halogen-containing resin, the additive of the present invention, and other additives may be performed by a conventional method capable of uniformly mixing the two. For example, any mixing and kneading means such as a single or twin screw extruder, a roll, and a Banbury mixer can be adopted. There are no particular restrictions on the molding method, for example, any of injection molding, extrusion molding, blow molding, press molding, rotational molding, calendar molding, sheet forming, transfer molding, laminate molding, vacuum molding, etc. The molding means can be employed.

  Hereinafter, the present invention will be described by way of examples.

[(A) Production of Compound of Metal Silicate and Calcium Hydroxide Compound]
In a stainless steel container of about 7 liters, 2.5 liters of water is added, and with stirring, a powder of synthetic aluminum silicate; (Al ₂ O ₃ ) _0.1 SiO _2. (H ₂ O) _0.83 (BET = 215 m ² / g) After adding 15 g, the temperature was raised to about 50 ° C., 320 g of calcium oxide (purity 98%) was added, the temperature was raised to about 90 ° C. while stirring, and the mixture was allowed to react for 15 minutes. Thereafter, 108 ml of an aqueous magnesium chloride (1.0 mol / liter) solution was added, and the mixture was further reacted for 10 minutes. Thereafter, 200 ml of an aqueous solution (about 80 ° C.) in which 15 g of sodium stearate (purity 90%) was dissolved was added for surface treatment. Thereafter, filtration, washing with water, drying (about 120 ° C.), and pulverization were performed. X-ray diffraction of this powder slightly shifted to the high angle side, but showed the same diffraction pattern as calcium hydroxide. The BET specific surface area was 45 m ² / g, and the average secondary particle size with a cumulative 50% was 1.1 μm. As a result of chemical analysis and fluorescent X-ray analysis, the chemical composition (molar ratio) was as follows. Ca: Mg: SiO ₂ : Al ₂ O ₃ = 0.98: 0.02: 0.03: 0.003.

In Example 1, instead of synthetic aluminum silicate, zinc aluminum silicate; (ZnO) _0.09 (Al ₂ O ₃ ) _0.01 SiO _2. (H ₂ O) _0.80 powder (BET = 250 m ² / G) The same procedure as in Example 1 was conducted except that 29 g was added and 56 ml of an aqueous solution of zinc chloride (1.0 mol / liter) was used instead of magnesium chloride. X-ray diffraction of the obtained powder showed a diffraction pattern of calcium hydroxide although it was slightly shifted to the high angle side. The BET specific surface area was 42 m ² / g, and the average secondary particle size with a cumulative 50% was 0.98 μm. As a result of chemical composition analysis, the molar ratio was as follows. Ca: Zn: SiO ₂ : Al ₂ O ₃ = 0.99: 0.01: 0.06: 0.002.

In Example 1, activated clay instead of aluminum silicate; (Al ₂ O ₃ ) _0.07 (MgO) _0.04 SiO _2. (H ₂ O) _0.23 powder (BET = 290 m ² / g) 35 g Was used in the same manner as in Example 1 except that steryl acid phosphate (used after being dissolved in isopropyl alcohol by heating) was used instead of sodium stearate, and magnesium chloride was not used. X-ray diffraction of the obtained powder showed a diffraction pattern of only calcium hydroxide. The BET specific surface area was 40 m ² / g, and the average secondary particle size with a cumulative 50% was 1.2 μm. The chemical composition is Ca: SiO ₂ : Al ₂ O ₃ = 1: 0.075: 0.005 in molar ratio.

(A) a composite of a metal silicate and a calcium hydroxide-based compound obtained in Examples 1 to 3, and (B) a hydrotalcite [commercially available alkamizer 1, roughly chemical composition; Mg _{0. 08} Al _0.32 (OH) ₂ (CO ₃ ) _0.16 (H ₂ O) _0.5 ] and the following formulation: Polyvinyl chloride (molecular weight 700) 100 parts by weight TOTM (tri-2-ethylhexyl trimellitate) 50 parts by weight Calcium carbonate 50 parts by weight Zn stearate 0.4 part by weight Ca stearate 0.1 part by weight DBM / SBM 0.2 part by weight Irganox 1010 0.1 part by weight Stabilizer 2.7 parts by weight Congo red test at 200 ° C. (C), based on JIS-K6723, using the resulting sheet and kneading with an open roll at 170 ° C. for 5 minutes. ) Performs, 190 ° C., subjected to press heat-resistance test at a pressure of 100 kg / cm ^2, were evaluated colored state and blackening time after 60 minutes. The results are shown in Table 1.

[Comparative Example 5]
In Example 1, it carried out like Example 1 except not using a metal silicate and magnesium chloride. The obtained powder had a BET specific surface area of 7 m ² / g and an average secondary particle diameter of 50% cumulative was 2.2 μm.

(A) The composite obtained in Example 1 and the following prescription were used together with a tin-based stabilizer (dimethyltin mercaptide) in a weight ratio of 30:70, and after kneading at 180 ° C. with an open roll, A press heat resistance test was performed at 200 ° C. and 100 kg / cm ² .
100 parts by weight of PVC
Lubricant (Loxiol G32) 0.50 parts by weight
Lubricant (Loxiol G70S) 0.30 parts by weight
Tin stabilizer 0.8 parts by weight
(A) Composite product As a comparison of 0.4 parts by weight, evaluations were also made when only 1 part of tin stabilizer was used (Comparative Example 6) and when only (A) the composite product was used (Comparative Example 7). It was. With this formulation, the dynamic thermal stability testability was measured using a BRABENDER plastograph at a temperature of 190 ° C. and a rotational speed of 40 r. It was performed under the conditions of pm and a filling amount of 60 g. The results are shown in Table 2.

Moreover, as a result of measuring the softening temperature by the Vicat method, it was found that 84 ° C. was improved to 85.4 ° C. in Example 5 with tin alone (Comparative Example 6).

Claims (10)

100 parts by weight of halogen-containing resin (A) metal silicate and calcium hydroxide compound represented by the following formula (1)

(However, in the formula, M ²⁺ represents at least one divalent metal such as Mg, Zn, or Cu, and x and y are in the range of 0 ≦ x ≦ 0.4 and 0 ≦ y <0.1, respectively. A stabilized halogen-containing resin composition comprising 0.01 to 10 parts by weight of a composite of (A) and (B) a hydrotalcite and / or (C) a tin-based stabilizer. The (A) metal silicate of claim 1 is represented by the following formula (2):

(Wherein, M ²⁺ represents at least one of Zn, Mg and Ca, and a, b and m are 0 ≦ a ≦ 0.5, 0 ≦ b <1, 0 <a + b <1, 0 ≦, respectively. The halogen-containing resin composition according to claim 1, which is represented by m <2). The halogen-containing resin composition according to claim 1, wherein the metal silicate of claim 1 is activated clay and / or acid clay. The calcium hydroxide compound according to claim 1 is represented by the following formula (3):

The halogen-containing resin composition according to claim 1, which is a calcium hydroxide compound represented by the formula (wherein M ²⁺ and x are the same as those in the formula (1)). The halogen-containing resin composition according to claim 1, wherein M ^{2+ in} the formula (2) of claim 4 is Mg and / or Zn, and the range of x is 0 ≦ x ≦ 0.2. 2. The halogen-containing resin composition according to claim 1, wherein in the composite (A) of claim 1, the metal silicate is composited at a ratio of 0.5 to 50 wt% with respect to the calcium hydroxide compound. object. The weight ratio of (A) :( B) = 40: 60 to 75:25 in (A) the composite of metal silicate and calcium hydroxide compound and (B) hydrotalcite in claim 1 A halogen-containing resin composition for high heat-resistant electric wires, which is used in a mixture. In Claim 1, the mixing weight ratio of (A) the composite of a metal silicate and a calcium hydroxide compound and (C) a tin stabilizer is (A) :( C) = 15: 85-40: 60. The stabilized halogen-containing resin composition according to claim 1, wherein the composition is 60. The complex of (A) the metal silicate and the calcium hydroxide compound of claim 1 is a higher fatty acid, an alkali metal salt of a higher fatty acid, a phosphate ester, a silane-based, aluminum-based or titanium-based coupling agent. 10. The composite according to claim 1 or 9, wherein the composite is surface-treated with at least one or more selected from the above in an amount of 0.1 to 10% by weight based on the composite. 2. A hydration reaction of calcium oxide in an aqueous medium in which a metal silicate is dispersed, a water-soluble divalent metal salt aqueous solution such as Mg and Zn is added and reacted, and then surface treatment is performed. (9) A method for producing a composite product of (9).